题目内容

计算:
(1)-3+5.3+7-5.3
(2)(-2)×
3
2
÷(-
3
4
)×4

(3)-16-|-5|+2×(-
1
2
)2

(4)(
1
3
-
1
4
)÷(-
1
12
)+(-3)3÷(-3)

(5)-
1
2
+
1
2
÷[(-1
1
2
)
3
+(-
1
2
)
2
]×|-2.52|-
1
2
(1)-3+5.3+7-5.3
=-8.3+12.3
=4;

(2)(-2)×
3
2
÷(-
3
4
)×4

=2×
3
2
×
4
3
×4
=16;

(3)-16-|-5|+2×(-
1
2
)2

=-1-5+2×
1
4

=-1-5+
1
2

=-5
1
2


(4)(
1
3
-
1
4
)÷(-
1
12
)+(-3)3÷(-3)

=﹙
1
3
-
1
4
﹚×﹙-12﹚+﹙-3﹚2
=-4+3+9
=8;

(5)-
1
2
+
1
2
÷[(-1
1
2
)
3
+(-
1
2
)
2
]×|-2.52|-
1
2

=-
1
2
+
1
2
÷[-
27
8
+
1
4
25
4
-
1
2

=-
1
2
+
1
2
×﹙-
8
25
﹚×
25
4
-
1
2

=-
1
2
-1-
1
2

=-2.
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